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C FUNC      SOURCE    CHAT      05/01/13    00:11:36     5004c*****************************************************************************c       sous rouine utilisee dans l'ecoulement plastique de la loic       de GURSONc**********************************************************************        subroutine func(f,q,wrkgur)c       this subroutine compute the value of the functionc       which zero is the increment of phicc---    variables      IMPLICIT INTEGER(I-N)        IMPLICIT REAL*8 (A-H,O-Z)         segment wrkgur         real*8 sigbar, sy0,phi0,rho0,g,b,h         real*8 epn,phin,sqrtj2,rho,sig(6)         real*8 e(7),dt         real*8 conv,tol1,tol2        endsegment *        common/prop/sigbar,sy0,phi0,rho0,g,b,h*        common/state/epn,phin,sqrtj2,rho,sig(6)c*       common /toler/ conv,tol1,tol2cc***    evaluate function -- q is dphi        phi=phin+q        syn=sy0+h*epn        p=(1.d0-phi)*b*(1.d0-(1.d0-phi)*rho0/((1.d0-phi0)*rho))        syp=abs(1.d0+phi**2-2.d0*phi*cosh(-1.5d0*p/sigbar))c        if (syp .ge. tol1*tol1 ) then        a=1.5d0*phi*(1.d0-phi)*sinh(-1.5d0*p/sigbar)/sqrt(syp)c            if ( abs(a) .le. (1.d-2 * tol2) ) thenc       this is not consistent but this speeds up the convergence                dep=(sqrtj2-syn*(1-phi))/(3*g+h*(1-phi))            else                ratio=syn/(2.d0*h)                dep=sqrt(ratio**2+abs(q/a)*sigbar/h)-ratio            endifc        else            dep=0.d0        endifc        syn1p=(syn+h*dep)*sqrt(syp)        f=syn1p+3.d0*g*dep-sqrtj2        f=f/sy0c        return        endc*****************************************************************************

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